摘要
利用环形水槽及现场原沙,在动水絮凝条件下(模拟现场海水状况)探讨了自然情况下灌河口悬沙的起动及落淤状况,建立了泥沙平衡浓度与流速的关系,并由此得到某种沙的不淤流速值.试验结果表明,不同初始浓度的泥沙,其起动流速均为20m/s左右;应用麦克劳林沉降模式测出的30m/s流速以下的水流中的泥沙沉降速度为0.007m/s.
This paper deals with the properties of glomeration, incipience and deposition of suspended sediment form Guan he estuary by means of annular tank tests with the current driven by differential rotation of the lids (simulating the natural seawater current). An interrelation of the equilibrium concentration of the suspended sediment and the current velocity is established from which a nondepasition velocity of the suspended sediment is obtained. The incipient velocity is about 20 cm/s for different initial concentrations. By applying Makalolin's settling model to the measurement of the settling velocity ω of the suspended sediment it is obtained that ω is about 0. 007 cm/s for the current velocity under 30 cm/s.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
1993年第1期48-54,共7页
Journal of Hohai University(Natural Sciences)
基金
国家自然科学基金资助课题
关键词
环形水槽
河口泥沙
试验
annuliar tank
estuarial sediment
thershold velocity
settling velocity
